Improvement in cylinder-piston packings



C. H. HUTCHINSON.

CYLINDER mwen-PACKING.

Patented Feb. 29,1876.

N- PETERS. FNoa-LIYNOGRAPMER. WASHINGTON. D c.

clare the same to be ter than the expansive disks, tute a piston-head, to be aflxed toa rod.

the inner vI Dlxfrnlwr QFFIC CHARLES `H. HUTGHINSON, OF MANCHESTER, NEW HAMPSHIRE.

lMPROVEMENT IN CYLINDER-*PISTON PACKINGS..

' Specification forming part ot' Letters Patent No. 174,137, dated February 29, 1876; application filed Februar y 7, 1876.

To all whom t may concern: 'A

Be it known that I, CHARLES lLlElU'rcHf INsoN, ot' Manchester, in the county ot'- Hillsborough and State of New Hampshire, have invented a new and useful Improvement in Cylinder-Piston Packing; and do hereby defully described in the following specicatiomaud represented inthe accompanying drawings, of which- Figure l is a side view, and Fig. 2 a transi verse section, ot'a piston-head with my invenspecially relates to the metallic-A tion, which rin g packing.

The packing, as 'represented in the drawings,

consists of two expansive rings, A B, encompassing a single ring, C, that surrounds a hollowcylinder, D, projecting from a disk, E. Another such, but shorter cylinder, F, ex-

ltended from another disk, G, lits into the'cyl inder D. Each disk is a little less in dialnering next to it, the said expansive rings being between the two which, with the inner ring O, consti- Each expansive ring issplit-transversely and o bliquelythrough it, asl shown at a, and provided with a bridge, 1), fastened nearione end to the ring, and extending across the opening in the ring, all being vas shown.

In carrying out my invention I provide the inner ring C with two rabbets, d d, extending around it at its ends, there being midway be tween suclVIabbets a groove, e, in and around the said ring. Furthermore, -I provide each of the expansive-rings A B withv an internal ilange, f, to enter the next adjacent rabbet of ring. The outer edgeof 'each expansive ringhas also one or more shallow passages, g, made across it, as shown in Figs. Sand 4, the rst of which (figures) isa side View, and the second an edgeview, of one of suchriugs,`Fig. 5 being an inner edge view, and Fig. 6 a transverse section, of the ring. Each expansive ring isl also grooved` around its circumference, as shown ath, the distance between the said groove hand the next adjacent or flanged side ofthe ring being less than the thickness of the flange f.

holes, z', lead from the groove h into the interior of the expansive ring and back of the There is also an oblique groove, k,

ange.

One or more Y leading across the ring fromthc groove h, and

also across the inner edge ofthe ring. There are also sundry holes Z from the groove h leading. transversely through the rin gto its inner edge, and'from thence inward to theinner periphery of the ring.` Furthermore, there are Aalso one or more holes, m, leading' from each rabbet ofthe inner ring into the groove at the middle'of such ring, such being as shown in Fig. 7, which is a transverse section of the inner ring C. i

The main object of my improvement is to causethe steam when expanding either ring Aor B to exert its pressure, not on the `entire inner surface of the ring, entirely, upon the periphery ot the tlange f. The steam to expand the ring enters through the shallow passages g, and, acting on the inner edge of -the iiange, wardly. Should steam escapeby the outer edge of the ring, such steam will flow into the groove It, from whence it will. escape into the groove of the inner ring U, and from thence through the lateral passages m leading from the groove e to the rabbet in advance, and thence through such.

p. The grooves h in the ringsvA B serve to intercept any-surplus steam escaping, and thereby prevent collapsing oi' the rings, the pressure on the flanges being greater than on the parts ofthe rings that are between the grooves and'outer ends of the rings; f'

When steam is pressing on one ofthe rings A B to expand it, the other will allow the leaked steam, if any, to escape into the exhaust.

In a piston-packing, the combination of the inner ring C, provided with the groove c, the

two rabbets @Land their connecting-passages m with the two expansive rings A B,provided with the flanges f, circumscribing-grooves h, induction-passages g, and one or more passages leading from each ofthe said grooves, both to the internal periphery and inner sideof its ring, all being substantially as specified.

CHARLES H. vHmroHnvs'olv.

Witnesses R. H. EDDY, J R. SNOW.

but mostly, it not l presses the ring out- 

